SUN HYDRAULICS
RPETLAV

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics RPETLAV (Material Number: RPETLAV) is a pilot-operated, anti-shock relief cartridge designed to limit maximum system pressure and control the rate of pressure rise. This valve is engineered to open and subsequently ramp closed at a constant speed, independent of settings and flows. The adjust screw on the valve allows for customization of both the maximum relief setting and the minimum threshold setting. Notably, all 2-port relief cartridges are physically and functionally interchangeable for a given frame size, sharing the same flow path and cavity. This valve can handle maximum pressure at port 2, making it suitable for cross-port relief circuits but not recommended for load-holding applications. When inlet port 1 pressure exceeds the threshold setting, the valve opens to tank port 2, with the pilot section moving forward at a steady rate to increase the setting by compressing the pilot spring until a mechanical stop is reached. It effectively protects pumps and motors from pressure transients due to sudden load changes, particularly in variable displacement pumps which may not react swiftly enough. The RPETLAV also aids in reducing jerks in hydrostatic drives caused by sudden reversals and can provide ramp characteristics similar to proportional valves when used with a switching device. It supports small power units starting against an anti-shock relief for extended pump life. The back pressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. Incorporating Sun's floating style construction minimizes potential internal part binding due to excessive installation torque or machining variations. The valve features a T-10A cavity with Series 1 capacity of up to 25 gpm (95 L/min), operates up to 5000 psi (350 bar), and has typical response times around 2 ms with adjustment capabilities through clockwise turns of up to 4.5 turns.